Electrical connector and electrical connector assembly

Abstract

An electrical connector includes multiple signal terminal groups and multiple grounding members. Each signal terminal group includes multiple signal terminals, each signal terminal having a first contact portion and a second contact portion, the first contact portion being elastic and the second contact portion being relatively inelastic, and the first and second contact portions being staggered. The grounding members correspond to the signal terminal groups, respectively, and each grounding member comprises a rear wall and two side walls integrally constructed and surrounding the corresponding signal terminal group on at least three sides, two grounding terminals integrally formed and located on the left and right sides of the signal terminal group, respectively, a third contact portion respectively constructed on the two grounding terminals and being elastic, and a fourth contact portion respectively located on the left and right sides of the signal terminal group and being relatively inelastic, and the third and fourth contact portions being staggered.

Description

Technical Field

[0001] The present invention relates to an electrical connector, and in particular to an electrical connector and an electrical connector assembly. Background Art

[0002] Japanese Patent Publication No. Hei 05-007829B2 discloses a docking terminal structure, wherein the contact portions of two docking terminals each contact the fixed portion of the other terminal, forming two contact points between the two terminals to increase the stability of the terminal contact.

[0003] U.S. Patent Publication No. 7,798,852B2 discloses a mezzanine-type electrical connector comprising a plurality of terminal rows, wherein ground terminals and differential signal terminal pairs are alternately arranged in each terminal row. The ground terminals and differential signal terminal pairs of adjacent terminal rows correspond in position to each other, and the body portions of the ground terminals are wider, such that the width of the body portions of the ground terminals is greater than the width of the body portions of the differential signal terminal pairs when arranged side by side. This allows each differential signal terminal pair to be independently grounded and shielded. However, this shielding arrangement is only provided between the body portions of the terminals.

[0004] However, in order to further increase the signal transmission speed, it is necessary to further reduce the crosstalk interference of signal transmission, reduce the terminal impedance and strengthen the shielding between signal terminals. However, the existing electrical connectors such as the above-mentioned prior art still have shortcomings. Summary of the Invention

[0005] Therefore, one of the objects of the present invention is to provide an electrical connector and an electrical connector assembly that can improve at least one disadvantage of the prior art.

[0006] Therefore, in some embodiments, the electrical connector of the present invention includes multiple signal terminal groups and multiple grounding members. Each signal terminal group includes multiple signal terminals, each signal terminal has a first contact portion and a second contact portion, the first contact portion is elastic, the second contact portion is relatively inelastic, and the first contact portion and the second contact portion are staggered with each other. The grounding members correspond to the signal terminal groups respectively, and each grounding member has a rear wall and two side walls that are integrally constructed and surround the corresponding signal terminal group on at least three sides, two grounding terminals that are integrally formed and located on the left and right sides of the signal terminal group, respectively, a third contact portion that is respectively constructed on the two grounding terminals and is elastic, and a fourth contact portion that is respectively located on the left and right sides of the signal terminal group and is relatively inelastic, and the third contact portion and the fourth contact portion are staggered with each other.

[0007] In some embodiments, each side wall has a grounding terminal and a side plate portion, and the plate surface of the side plate portion is constructed with the fourth contact portion, wherein the third contact portion of the grounding terminal faces inward, and the fourth contact portion of the side plate portion faces outward, and the third contact portion and the fourth contact portion of each side wall are staggered front to back and up and down.

[0008] In some embodiments, each grounding member further has two front plate portions integrally constructed with the two side walls, the two front plate portions are respectively located on the left and right sides of the corresponding signal terminal group, and the relative outer edges of each front plate portion are connected to the corresponding side walls. Each front plate portion is constructed with a grounding terminal, and each grounding terminal has an elastic arm extending upward from the front plate portion, the third contact portion is located at the upper end of the elastic arm, and the fourth contact portion is located at the lower end of the elastic arm. The third contact portion and the fourth contact portion on each grounding terminal face forward and are staggered up and down.

[0009] In some embodiments, each grounding member further has two front plate portions that are integrally constructed with the two side walls, respectively. The two front plate portions are located on the left and right sides of the corresponding signal terminal group, and the relative inner edges of each front plate portion are connected to the corresponding side walls. Each front plate portion is constructed with a grounding terminal, and each grounding terminal has an elastic arm extending upward from the front plate portion. The third contact portion is located at the upper end of the elastic arm, and the fourth contact portion is located at the lower end of the elastic arm. The third contact portion and the fourth contact portion on each grounding terminal face forward and are staggered up and down.

[0010] In some embodiments, the rear wall and the two side walls of each grounding element are higher than the upper end of the corresponding signal terminal.

[0011] In some embodiments, each signal terminal has a fixed portion, a tail portion extending downward from the fixed portion, and an elastic arm extending upward from the fixed portion, the first contact portion is located at the upper end of the elastic arm, and the second contact portion is located at the lower end of the elastic arm, and the first contact portion and the second contact portion on each signal terminal face forward and are staggered up and down.

[0012] In some embodiments, each signal terminal group has two signal terminals constituting a differential pair, and an insulating block, the two signal terminals being arranged on the insulating block, a front surface of a fixed portion of each signal terminal being exposed from the insulating block and the remaining three surfaces being buried in the insulating block, and the second contact portion being constructed on the front surface of the fixed portion.

[0013] In some embodiments, a base is further included. The base has a plurality of assembly holes, and each assembly hole is used to assemble one of the signal terminal groups and one of the grounding members.

[0014] In some embodiments, the signal terminal groups and the grounding members corresponding to each other are first combined through a combined structure and then assembled to the base.

[0015] In some embodiments, the combined structure includes a protrusion and a socket that are combined with each other, the protrusion is configured on the rear side surface of the insulating block, and the socket is configured on the rear wall of the grounding member.

[0016] Therefore, in some embodiments, the electrical connector combination of the present invention includes two electrical connectors of the same structure and for docking with each other. Each electrical connector includes a plurality of signal terminal groups and a plurality of grounding parts. Each signal terminal group includes a plurality of signal terminals, each signal terminal having a first contact portion and a second contact portion, the first contact portion being elastic, the second contact portion being relatively inelastic, and the first contact portion and the second contact portion being staggered with each other. The grounding parts respectively correspond to the signal terminal groups, each grounding part having a rear wall and two side walls that are integrally constructed and surround the corresponding signal terminal group on at least three sides, two grounding terminals that are integrally formed and are respectively located on the left and right sides of the signal terminal group, a third contact portion that is respectively constructed on the two grounding terminals and is elastic, and a fourth contact portion that is respectively located on the left and right sides of the signal terminal group and is relatively inelastic, and the third contact portion and the fourth contact portion are staggered with each other. Among them, when the two electrical connectors are docked with each other, the two docking grounding parts of the two electrical connectors jointly surround the two docking signal terminal groups on all four sides; the third contact portion and the fourth contact portion between the two docking grounding parts contact each other to form a total of four grounding contact points, two of the four grounding contact points are located on the left and the other two are located on the right; the first contact portion and the second contact portion between the two docking signal terminals contact each other to form two signal contact points, and the two signal contact points are staggered up and down.

[0017] In some embodiments, each side wall has a grounding terminal and a side plate portion, and the plate surface of the side plate portion is constructed with the fourth contact portion, wherein the third contact portion of the grounding terminal faces inward, and the fourth contact portion of the side plate portion faces outward, and the third contact portion and the fourth contact portion of each side wall are staggered front to back and up and down.

[0018] In some embodiments, two of the four ground contact points located on the same side are staggered front to back and up to down, and the four ground contact points are in contact left to right.

[0019] In some embodiments, each grounding member further has two front plate portions integrally constructed with the two side walls, the two front plate portions are respectively located on the left and right sides of the corresponding signal terminal group, and the relative outer edges of each front plate portion are connected to the corresponding side walls. Each front plate portion is constructed with a grounding terminal, and each grounding terminal has an elastic arm extending upward from the front plate portion, the third contact portion is located at the upper end of the elastic arm, and the fourth contact portion is located at the lower end of the elastic arm. The third contact portion and the fourth contact portion on each grounding terminal face forward and are staggered up and down.

[0020] In some embodiments, each grounding member further has two front plate portions that are integrally constructed with the two side walls, respectively. The two front plate portions are located on the left and right sides of the corresponding signal terminal group, and the relative inner edges of each front plate portion are connected to the corresponding side walls. Each front plate portion is constructed with a grounding terminal, and each grounding terminal has an elastic arm extending upward from the front plate portion. The third contact portion is located at the upper end of the elastic arm, and the fourth contact portion is located at the lower end of the elastic arm. The third contact portion and the fourth contact portion on each grounding terminal face forward and are staggered up and down.

[0021] In some embodiments, two of the four ground contact points located on the same side are staggered up and down, and the four ground contact points are in front-to-back contact with each other.

[0022] In some embodiments, the rear wall and the two side walls of each grounding element are higher than the upper end of the corresponding signal terminal.

[0023] In some embodiments, each signal terminal has a fixed portion, a tail portion extending downward from the fixed portion, and an elastic arm extending upward from the fixed portion, the first contact portion is located at the upper end of the elastic arm, and the second contact portion is located at the lower end of the elastic arm. The first contact portion and the second contact portion on each signal terminal face forward and are staggered up and down, and the two signal contact points are in front-to-back contact with each other.

[0024] In some embodiments, each signal terminal group has two signal terminals constituting a differential pair, and an insulating block, the two signal terminals being arranged on the insulating block, a front surface of a fixed portion of each signal terminal being exposed from the insulating block and the remaining three surfaces being buried in the insulating block, and the second contact portion being constructed on the front surface of the fixed portion.

[0025] The present invention can form a more complete and comprehensive shielding effect for the signal terminals through the design and arrangement of the grounding members surrounding the signal terminals on multiple sides, thereby reducing crosstalk interference, lowering the impedance of the signal terminals, and strengthening the coupling between the signal terminal groups, thereby improving signal integrity and increasing signal transmission speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Other features and technical effects of the present invention will be clearly presented in the embodiments with reference to the accompanying drawings, in which:

[0027] Figure 1 is a perspective view of a first embodiment of the electrical connector assembly of the present invention, in which two electrical connectors of the first embodiment are connected to each other;

[0028] Figure 2 yes Figure 1 A three-dimensional exploded view of

[0029] Figure 3 Therefore Figure 2 A three-dimensional exploded diagram that goes one step further;

[0030] Figure 4 is a perspective exploded view of the signal terminal assembly and the grounding member of the first embodiment;

[0031] Figure 5 yes Figure 4 An exploded perspective view of the first embodiment viewed from different perspectives;

[0032] Figure 6 is a front view of the signal terminal assembly and the grounding member of the first embodiment;

[0033] Figure 7 is a perspective view of the signal terminal groups and grounding members of the two electrical connectors of the first embodiment when they are mated with each other;

[0034] Figure 8 yes Figure 7 A cross-sectional view illustrating the contact relationship between the signal terminal groups of the two electrical connectors;

[0035] Figure 9 yes Figure 7 Another cross-sectional view illustrating the contact relationship between the grounding members of the two electrical connectors;

[0036] Figure 10 is a perspective view of a second embodiment of the electrical connector assembly of the present invention, in which the two electrical connectors of the second embodiment are not yet connected to each other;

[0037] Figure 11 is an exploded perspective view of the signal terminal assembly and the grounding member of the second embodiment;

[0038] Figure 12 is a front view of the signal terminal assembly and the grounding member of the second embodiment;

[0039] Figure 13 is a perspective view of the signal terminal groups and grounding members of the two electrical connectors of the second embodiment when they are mated with each other;

[0040] Figure 14 is a side view of the signal terminal groups and grounding members of the two electrical connectors of the second embodiment when they are mated with each other;

[0041] Figure 15 is a perspective view of a third embodiment of the electrical connector assembly of the present invention, in which two electrical connectors of the third embodiment are mated with each other;

[0042] Figure 16 yes Figure 15 A three-dimensional exploded view of

[0043] Figure 17 is a top view of the electrical connector of the third embodiment, with the base of the third embodiment omitted in the figure;

[0044] Figure 18 Therefore Figure 16 A three-dimensional exploded view that is a step further; and

[0045] Figure 19 It is a three-dimensional view of the signal terminal sets and the grounding members of the two electrical connectors of the third embodiment when they are connected to each other.

[0046] Explanation of symbols

[0047] 100 electrical connector assembly

[0048] 200 electrical connector

[0049] 1 base

[0050] 11 Assembly holes

[0051] 12 docking convex part

[0052] 13 docking recess

[0053] 121 storage tank

[0054] 2 signal terminal groups

[0055] 21 signal terminal

[0056] 211 Fixed part

[0057] 211a front surface

[0058] 211b Perforation

[0059] 212 tail

[0060] 213 elastic arm

[0061] 214 first contact portion

[0062] 215 Second contact portion

[0063] 22 Insulation Block

[0064] 3 Grounding piece

[0065] 31 posterior wall

[0066] 32 sidewalls

[0067] 321 side panel

[0068] 33 tail

[0069] 34 Ground terminal

[0070] 341 extension

[0071] 342 elastic arm

[0072] 35 Third contact part

[0073] 36 Fourth contact portion

[0074] 37 front panel

[0075] 371 lateral edge

[0076] 371a Interference bump

[0077] 372 medial edge

[0078] 4 Combined construction

[0079] 41 Bump

[0080] 411 Ribs

[0081] 42 jacks

[0082] D1 Up and down direction

[0083] D2 front-to-back direction

[0084] D3 left and right direction

[0085] CS signal contact

[0086] CG ground contact DETAILED DESCRIPTION

[0087] Before the present invention is described in detail, it should be noted that similar elements are denoted by the same reference numerals in the following description.

[0088] See Figures 1 to 4A first embodiment of the electrical connector assembly 100 of the present invention includes two electrical connectors 200 of identical structure and adapted to mate with each other along a vertical direction D1 (the direction indicated by the arrow is upward, and the direction opposite is downward). Each electrical connector 200 includes a base 1, a plurality of signal terminal groups 2, and a plurality of grounding members 3.

[0089] The base 1 extends along a front-to-back direction D2 (arrow direction indicates front, reverse direction indicates rear) and a left-to-right direction D3 (arrow direction indicates left, reverse direction indicates right) and has a plurality of assembly holes 11 formed therethrough. Each assembly hole 11 is used to assemble one of the signal terminal assemblies 2 and one of the grounding members 3.

[0090] Each signal terminal assembly 2 includes two signal terminals 21 forming a differential pair and extending generally along the vertical direction D1 and arranged side by side along the horizontal direction D3, and an insulating block 22. Each signal terminal 21 has a fixed portion 211 disposed on the insulating block 22, a tail portion 212 extending downward from the fixed portion 211, a resilient arm 213 extending upward from the fixed portion 211, a first contact portion 214 located at the upper end of the resilient arm 213, and a second contact portion 215 located at the lower end of the resilient arm 213. The first contact portion 214 is resilient, while the second contact portion 215 is relatively inelastic. Furthermore, the first contact portion 214 and the second contact portion 215 face forward and are vertically offset from each other. The two signal terminals 21 are, for example, provided on the insulating block 22 by insert molding (or overmolding). A front surface 211a of the fixing portion 211 of each signal terminal 21 is exposed to the insulating block 22 and the remaining three surfaces are buried in the insulating block 22. Specifically, the second contact portion 215 is constructed on the front surface 211a of the fixing portion 211. In addition, the fixing portion 211 is, for example, further formed with a through hole 211b that cooperates with the insulating block 22 to increase the embedding bonding force. Figure 8 As shown, when the two electrical connectors 200 are docked with each other, the electrical connector 200 located on the upper side is flipped accordingly, and the first contact portion 214 and the second contact portion 215 between the two docked signal terminals 21 contact each other to form two signal contact points CS. The two signal contact points CS are staggered up and down, and the two signal contact points CS are in contact with each other front and back.

[0091] See Figures 3 to 6The grounding members 3 correspond to the corresponding signal terminal groups 2. Each grounding member 3 comprises a rear wall 31 and two side walls 32 integrally formed and surrounding the corresponding signal terminal group 2 on three sides; four tail portions 33 extending downward from the bottom edges of the rear wall 31 and the two side walls 32; two grounding terminals 34 integrally formed and located on the left and right sides (outside) of the signal terminal group 2; two third contact portions 35 respectively constructed on the two grounding terminals 34 and having elastic properties; and two fourth contact portions 36 respectively located on the left and right sides (outside) of the signal terminal group 2 and having relatively non-elastic properties. The third contact portions 35 and the fourth contact portions 36 are staggered from each other. In this first embodiment, each side wall 32 comprises one grounding terminal 34 and a side plate portion 321 extending forward from the side edge of the rear wall 31. The grounding terminal 34 has an extension 341 extending forward from the lower side edge of the rear wall 31, and a resilient arm 342 extending upward from the extension 341. The third contact portion 35 is located at the upper end of the resilient arm 342. The side plate 321 extends forward from the upper side edge of the rear wall 31 and is located behind the resilient arm 342 of the grounding terminal 34. The fourth contact portion 36 is formed on the surface of the side plate 321. The grounding terminal 34 is located on the relatively outer side, with the third contact portion 35 facing inward. The side plate 321 is located on the relatively inner side, with the fourth contact portion 36 facing outward. The third and fourth contact portions 35, 36 of each side wall 32 are staggered front-to-back and top-to-bottom. Specifically, the third contact portion 35 is located above and in front of the fourth contact portion 36. Furthermore, the rear wall 31 and two side walls 32 of each grounding member 3 are taller than the tops of the corresponding signal terminals 21 to enhance shielding. Specifically, two of the four tails 33 are located at the bottom edge of the rear wall 31, while the other two are located at the bottom edges of the two side walls 32. Therefore, the four tails 33 of the grounding member 3 surround the two tails 212 of the two signal terminals 21 on three sides. Both the tails 33 of the grounding member 3 and the tails 212 of the signal terminals 21 are racket-shaped and are used to connect to a circuit board (not shown) via, for example, solder balls.

[0092] See Figure 2 and Figures 7 to 9When the two electrical connectors 200 are mated, the two mating grounding members 3 of the two electrical connectors 200 jointly surround the two mating signal terminal groups 2 on all four sides. The third contact portion 35 and the fourth contact portion 36 between the two mating grounding members 3 contact each other to form a total of four grounding contact points CG. Two of the four grounding contact points CG are located on the left side and the other two are located on the right side. In addition, two of the four grounding contact points CG located on the same side are staggered front-to-back and up-and-down, and each of the four grounding contact points CG makes contact left-to-right. The design and arrangement of the grounding members 3 surrounding the signal terminals 21 on multiple sides can form a more complete and comprehensive shielding effect for the signal terminals 21, thereby reducing crosstalk interference, lowering the impedance of the signal terminals 21, and strengthening the coupling between the signal terminal groups 2, thereby improving signal integrity and increasing signal transmission speed.

[0093] See Figure 4 、 Figure 5 and Figure 7 In addition, in this first embodiment, the corresponding signal terminal assembly 2 and the grounding member 3 are first combined via a combination structure 4 before being assembled to the base 1. Specifically, the combination structure 4 includes a protrusion 41 and a socket 42 that are combined with each other. The protrusion 41 is constructed on the rear side of the insulating block 22, and the socket 42 is constructed on the rear wall 31 of the grounding member 3. For example, the protrusion 41 may have a plurality of ribs 411 that interfere with the inner wall surface of the socket 42. In other embodiments, the protrusion 41 may also be formed on the grounding member 3, and the socket 42 is formed on the insulating block 22.

[0094] See Figures 10 to 12 A second embodiment of the electrical connector assembly 100 of the present invention differs from the first embodiment in that each grounding member 3 further comprises two front plate portions 37 integrally constructed with the two side walls 32, the opposite outer edges 371 of each front plate portion 37 being connected to the lower section of the front edge of the corresponding side wall 32 and extending inwardly relative to the side wall 32 so as to be respectively located on the left and right sides (outside) of the corresponding signal terminal group 2 and at the front ends of the left and right sides of the insulating block 22, each front plate portion 37 being constructed with an upwardly extending grounding terminal 34, each grounding terminal 34 having an elastic arm 342 extending upward from the front plate portion 37, the third contact portion 35 being located at the upper end of the elastic arm 342, and the fourth contact portion 36 being located at the lower end of the elastic arm 342, the third contact portion 35 and the fourth contact portion 36 on each grounding terminal 34 facing forward and staggered up and down.

[0095] See Figures 12 to 14When the two electrical connectors 200 are mated, the third contact portion 35 and the fourth contact portion 36 of the two mating grounding members 3 contact each other, forming a total of four grounding contact points CG. Two of these four grounding contact points CG, located on the same side, are staggered vertically, and the four grounding contact points CG each make front-to-back contact. Furthermore, in this second embodiment, two of the four tail portions 33 of the grounding member 3 are respectively formed on the bottom edges of the two front plate portions 37.

[0096] See Figures 15 to 19 A third embodiment of the electrical connector assembly 100 of the present invention differs from the second embodiment in that the two side walls 32 extend forward and outward at an angle from the lower sections of the two side edges of the rear wall 31. The opposing inner edges 372 of each front panel portion 37 are connected to the front edges of the corresponding side walls 32 and extend outward relative to the side walls 32. Furthermore, the opposing outer edges 371 of each front panel portion 37 form interference protrusions 371a that interfere with the assembly holes 11 to enhance the fixing force. Furthermore, in this third embodiment, the signal terminal assembly 2 and the grounding member 3 are separately assembled to the base 1. The assembly structure 4 includes the protrusion 41 and the receptacle 42, which are assembled together. The protrusion 41 is constructed at the bottom of the rear side surface of the insulating block 22, and the receptacle 42 is constructed at the bottom edge of the rear wall 31 of the grounding member 3. Furthermore, in this third embodiment, the base 1 has a plurality of upwardly protruding docking protrusions 12 and docking recesses 13 located between adjacent docking protrusions 12. The docking protrusions 12 are spaced apart and arranged side by side along the front-to-back direction D2. The signal terminal groups 2 and the grounding members 3 are arranged and assembled on the front and rear sides of each docking protrusion 12, and each docking protrusion 12 is formed with a plurality of accommodating grooves 121 for accommodating the signal terminals and the grounding terminals.

[0097] In summary, the present invention can form a more complete and comprehensive shielding effect for the signal terminal 21 through the design and arrangement of the grounding member 3 surrounding the signal terminal 21 on multiple sides, thereby reducing crosstalk interference, reducing the impedance of the signal terminal 21, and strengthening the coupling between the signal terminal groups 2, so as to improve the integrity of the signal and increase the signal transmission speed.

[0098] The above descriptions are merely embodiments of the present invention and should not be used to limit the scope of the present invention. All simple equivalent changes and modifications made according to the claims and the contents of the patent specification of the present invention are still within the scope of the present invention.

Claims

1. An electrical connector, comprising: a plurality of signal terminal groups, each signal terminal group including a plurality of signal terminals, each signal terminal having a first contact portion and a second contact portion, the first contact portion being elastic, the second contact portion being relatively less elastic than the first contact portion, and the first contact portion and the second contact portion being staggered; and A plurality of grounding members respectively corresponding to the plurality of signal terminal groups, each grounding member having an integral structure and a rear wall and two side walls surrounding the corresponding signal terminal group on at least three sides, two grounding terminals formed in an integral structure and respectively located on the left and right sides of the signal terminal group, third contact portions respectively constructed on the two grounding terminals and having elasticity, and fourth contact portions respectively located on the left and right sides of the signal terminal group and having relatively less elasticity than the third contact portions, wherein the third contact portion and the fourth contact portion are staggered with each other.

2. The electrical connector according to claim 1, wherein Each side wall has a grounding terminal and a side plate portion, and the plate surface of the side plate portion is constructed with the fourth contact portion, wherein the third contact portion of the grounding terminal faces inward, and the fourth contact portion of the side plate portion faces outward, and the third contact portion and the fourth contact portion of each side wall are staggered front to back and up to down.

3. The electrical connector according to claim 1, wherein: Each grounding member also has two front plate portions that are integrally constructed with the two side walls, respectively. The two front plate portions are located on the left and right sides of the corresponding signal terminal group, and the relative outer edges of each front plate portion are connected to the corresponding side wall. Each front plate portion is constructed with one of the grounding terminals, and each grounding terminal has an elastic arm extending upward from the front plate portion. The third contact portion is located at the upper end of the elastic arm, and the fourth contact portion is located at the lower end of the elastic arm. The third contact portion and the fourth contact portion on each grounding terminal face forward and are staggered up and down.

4. The electrical connector according to claim 1, wherein: Each grounding member also has two front plate portions that are integrally constructed with the two side walls, respectively. The two front plate portions are located on the left and right sides of the corresponding signal terminal group, and the opposite inner edges of each front plate portion are connected to the corresponding side wall. Each front plate portion is constructed with one of the grounding terminals, and each grounding terminal has an elastic arm extending upward from the front plate portion. The third contact portion is located at the upper end of the elastic arm, and the fourth contact portion is located at the lower end of the elastic arm. The third contact portion and the fourth contact portion on each grounding terminal face forward and are staggered up and down.

5. The electrical connector according to claim 1, wherein: The height of the rear wall and the two side walls of each grounding element is higher than the upper end of the corresponding signal terminal.

6. The electrical connector according to claim 1, wherein: Each signal terminal has a fixed portion, a tail portion extending downward from the fixed portion, and an elastic arm extending upward from the fixed portion. The first contact portion is located at the upper end of the elastic arm, and the second contact portion is located at the lower end of the elastic arm. The first contact portion and the second contact portion on each signal terminal face forward and are staggered up and down.

7. The electrical connector according to claim 6, wherein: Each signal terminal group includes two signal terminals constituting a differential pair, and an insulating block. The two signal terminals are provided on the insulating block. A front surface of a fixed portion of each signal terminal is exposed from the insulating block, and the remaining three surfaces are buried in the insulating block. The second contact portion is constructed on the front surface of the fixed portion. 8 . The electrical connector as claimed in claim 7 , further comprising a base having a plurality of assembly holes, each assembly hole being used to assemble one of the signal terminal sets and one of the grounding members.

9. The electrical connector according to claim 8, wherein: The signal terminal group and the grounding member corresponding to each other are first combined through a combined structure and then assembled to the base.

10. The electrical connector according to claim 9, wherein The combined structure includes a convex block and a socket that are combined with each other. The convex block is constructed on the rear side surface of the insulating block, and the socket is constructed on the rear wall of the grounding piece.

11. An electrical connector assembly comprising two electrical connectors of identical structure for docking with each other, each electrical connector comprising: a plurality of signal terminal groups, each signal terminal group including a plurality of signal terminals, each signal terminal having a first contact portion and a second contact portion, the first contact portion being elastic, the second contact portion being less elastic than the first contact portion, and the first contact portion and the second contact portion being staggered; and a plurality of grounding members corresponding to the plurality of signal terminal groups, each grounding member comprising a rear wall and two side walls integrally formed and surrounding the corresponding signal terminal group on at least three sides, two grounding terminals integrally formed and located on left and right sides of the signal terminal group, respectively, a third contact portion respectively constructed on the two grounding terminals and having elasticity, and a fourth contact portion respectively located on left and right sides of the signal terminal group and having less elasticity than the third contact portion, the third contact portion and the fourth contact portion being staggered; in, When the two electrical connectors are docked with each other, the two docking grounding members of the two electrical connectors jointly surround the two docking signal terminal groups on all four sides; the third contact portion and the fourth contact portion between the two docking grounding members contact each other to form a total of four grounding contact points, two of which are located on the left and the other two are located on the right; the first contact portion and the second contact portion between the two docking signal terminals contact each other to form two signal contact points, and the two signal contact points are staggered up and down.

12. The electrical connector assembly according to claim 11, wherein: Each side wall has a grounding terminal and a side plate portion, and the plate surface of the side plate portion is constructed with the fourth contact portion, wherein the third contact portion of the grounding terminal faces inward, and the fourth contact portion of the side plate portion faces outward, and the third contact portion and the fourth contact portion of each side wall are staggered front to back and up to down.

13. The electrical connector assembly according to claim 12, wherein: Two of the four grounding contact points located on the same side are staggered front to back and up to down, and the four grounding contact points are in contact left to right.

14. The electrical connector assembly according to claim 11, wherein: Each grounding member also has two front plate portions that are integrally constructed with the two side walls, respectively. The two front plate portions are located on the left and right sides of the corresponding signal terminal group, and the relative outer edges of each front plate portion are connected to the corresponding side wall. Each front plate portion is constructed with one of the grounding terminals, and each grounding terminal has an elastic arm extending upward from the front plate portion. The third contact portion is located at the upper end of the elastic arm, and the fourth contact portion is located at the lower end of the elastic arm. The third contact portion and the fourth contact portion on each grounding terminal face forward and are staggered up and down.

15. The electrical connector assembly according to claim 11, wherein: Each grounding member also has two front plate portions that are integrally constructed with the two side walls, respectively. The two front plate portions are located on the left and right sides of the corresponding signal terminal group, and the opposite inner edges of each front plate portion are connected to the corresponding side wall. Each front plate portion is constructed with one of the grounding terminals, and each grounding terminal has an elastic arm extending upward from the front plate portion. The third contact portion is located at the upper end of the elastic arm, and the fourth contact portion is located at the lower end of the elastic arm. The third contact portion and the fourth contact portion on each grounding terminal face forward and are staggered up and down.

16. The electrical connector assembly according to claim 14 or claim 15, wherein: Two of the four grounding contact points located on the same side are staggered up and down, and the four grounding contact points are in front-to-back contact.

17. The electrical connector assembly according to claim 11, wherein: The height of the rear wall and the two side walls of each grounding element is higher than the upper end of the corresponding signal terminal.

18. The electrical connector assembly according to claim 11, wherein: Each signal terminal has a fixed portion, a tail portion extending downward from the fixed portion, and an elastic arm extending upward from the fixed portion. The first contact portion is located at the upper end of the elastic arm, and the second contact portion is located at the lower end of the elastic arm. The first contact portion and the second contact portion on each signal terminal face forward and are staggered vertically. The two signal contact points are in front-to-back contact with each other.

19. The electrical connector assembly according to claim 18, wherein: Each signal terminal group includes two signal terminals constituting a differential pair, and an insulating block. The two signal terminals are provided on the insulating block. A front surface of a fixed portion of each signal terminal is exposed from the insulating block, and the remaining three surfaces are buried in the insulating block. The second contact portion is constructed on the front surface of the fixed portion.

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